Sandpapering machine



m 1931. A. EMMONS a 1,821,624

SANDPAPERING MACHINE Filed June 26, 1926 2 Sheets-Sheet 1 ATTORNEYS f p 3 Y A. N. EMMONS 1,821,624

SANDPAPERING mAcnnm Filed June 26, 1926 2 Sheets-Sheet 2 ,0 6 INVENTOR.

A-TTORNEY5,

i atented Sept. 1, 1931 UNITED STATES PATIENT OFFICE ARTHUR N. EMMQNS, OF NEDROW, NEW YORK, ASSIGNOR TO THE PORTER-CABLE MAGHINECOMPANY, OF SYRACUSE, YORK, A CORPORATION OF NEW YORK SANDPAPERING- MACHINE Application filed .lune 26,

Thisinvention' relates. to abrading machines for polishing surfaces as floors and the like, which machine is particularly simple and compact in construction, highly efficient and durable in use.

The invention consists in the novel features and in the combinations and construction hereinafter set forthjand claimed.

In describing this invention reference is had to the accompanying drawings in which I like characters represent corresponding parts in all the views.

Figures 1 and 2 are, respectively, a side elevation and a plan view of an abrading machine embodying my invention;

Figure 3 is a horizontal sectional view on line 33, Figure 1.

Figure 4 is a vertical sectional'view on line 44, Figure 1. p

Figure 5 is a side elevationof the frame, one of the rollers and the belt being removed and the driving mechanism for the other roller being shown in section.

TlllS abradmg machine comprises, generally, a frame, a pair of rollers suitably supported from the frame, an abrading or band belt movable over the rollers and means including a motor carried by the frame for actuating one of the rollers. It further includes a" construction by which the belt is readily applied and removed from the rollers and means for adjusting one .'of the rollers to tighten the belt and to straighten the belt on the rollers.

1 designates the frame, which may be of any suitable form, size and construction, it being here shown as comprising top plate 2 having a handle 3 thereon and also a bracket or v housing 4 withinkwhieh the motor is mounted.

The top plate 2 terminates in down turned or curved flange 5 at one end forming a guard.

6 and 7 are the rollers suitably'supported from the frame, one of the rollers as the driving roller 6 being keyed to an axle or spindle 8 journaled' in bearings 8 in the frame, this axle being connected to-the motor located within the casing 4. The motor is preferably an electric motor, the armature shaft 9 of which is arranged in vertical position and connected to the axle 7. As here 1926. Serial No. 118,660.

shown this shaft 9 has a worm 10' thereon meshing with the worm wheel 11 on the axle or spindle 7. The worm 10 and worm wheel 11 are locatedwithin a housing 12 forming part of the main frame, which housing is provided with a cover 13 formed with the bearing ltfor the outer end of the spindle 7. -T he motor is controlled by suitable electric switch 15.

One of the rollers as the roller 7 is adjustable rectilinearly toward and from the other to tighten the belt 16 and is also adjustable angularly tostraighten the belt.

In the illustrated embodiment of my invention the roller 7' is mounted on a spindle 17 supported by a carrier 18 movable forwardly and rearwardlyin suitable guides formed in the frame 1, the carrier being here shown as formed with a head movable in a suitable guide slot or way 19, and with a stem 20 movable in a passage 21 in the frame 1, the stem being thrust outwardly by a spring 22 located in the passage 21 between the bottom thereof and the end of the stem. The spring 22 thus'tends to thrust the carrier outwardly.

and carry the roller 7 away fromthe roller 6, and thus keep the belt under the tension of the spring 22. However, if. desired after the belt has been tightened it may be relieved of the spring tension by tightening a set nut 23 threading into the stem 20 through a slot 25 in the guide for said stem 20.

e In placing a belt on therollers, the car rier 18 is retracted against a spring and held in its retracted position by turning the set nut 23. After the belt is applied to the rollers the set nut 23 can be loosened, the spring 23 will react and thrust the-carrier 18 and the roller 7 belt.

The belt is straightened so asto not run off one side or the other of the rollers by adjusting the angle of one of the rollers as the roller 7. This angular adjustment is brought about by pivoting the spindle 17 at 26 to the carrier on a transverse axis and providing means for shifting or adjusting the spindle on its pivot 26 and holding it in its adjusted position. As here illustrated the spindle 17 is formed with an angular adjustoutwardly and tighten the combination of a a ing arm 27 through which a screw 28 extends,

the screw threading into the carrier. The thrust of the screw is against a spring 29 acting on the arm 27. Obviously the turning of the screw 28 to the right will swing the axle 17 and the roller 7 outwardly or downwardly; Figure 3. Unscrewing of the screw 28 will permit the spring 29 to swing the axle inwardly or upwardly, Figure 3. This swinging of the axle'17 to the proper angle will cause the belt to run straight of the I rollers. The rollers are higher or of greater 29 frame or support terminates near and preferably short of the vertical planes of the outer edge of the belt, so that the belt can work up close to the edge of a surface being voperated upon, as for instance the edge of a floor close to the mop or'base board; or in any other analogous situation. I Owing to the fact that the spindles are supported on like ends of the rollers only, the other ends of the rollers are unobstructed mso that the belt can be slipped on and off the rollers. The belt 26 is usually of a material as sand paper. The lower run of the belt passes over a surface '30 on the frame, which surface holds the belt against the sursaface being operated on.v In operation the beltor band is readilyapplied to the rollers by compressing the carrier 18 against the action of the spring 22 looking b screws 23 and then slipping the belt or ban over thefree ends of the roll ers. The spring 22- is then allowedto react by looseningthe nut 23. If the belt does not run true over the rollers, the angle of the rollers ,7 ,is changed by turning the adjusting screw 28. The tool is held with the lower run-of the belt on the surface to be smooth or polished and the like, while the belt is running. Obviously owing to the manner in which the rollers are supported a worn out band or belt can be readily applied, and a new one removed and the rollers readily adjusted to give the proper attention to the n w beltv or. and. 1 What. claimisz- 1 '1 1. In a. portable abrading machine, the

axles for one of the rollers and mechanism carried by the body for driving one of the axles, an abrading belt, movable over the rollers, a carriage carried by the frame be- 7 tending along the carriage forming a bell tween the rollers and movable forwardly and rearwardly toadjust one roller toward.

. and from the other to tighten the belt, the

i axle, upon which the adjustable roller is mounted being pivoted ,at one end to the frame, a. pair of rollers,

carriage on an axis extending at an angle.

justing andholding the carriage in, its ad-' justed position and means carried by the carriage for'adjusting the angle of the axle a of the adjustable roller forwardly and rearwardl'y and holding it in its adjusted position. '2.-In a portable abrading machine, the

combination of a frame, a pair of spaced apart rollers, axles on which the rollers are mounted, the axles being mounted at like ends on theframe and having their other ends free, means for driving one of the axles,

an abrading belt movable over the rollers, the frame and associated-parts terminating near the vertical plane of the outer edge of the rollers toward the free ends thereof whereby no part of the frame projects be yond the outer edge of the belt.

on which the rollers are mounted, the axle 3. In a portable abrading machine, the combination of a frame, a pair of rollers, an abrading belt movable over the rollers, axles' for one roller being mounted in the frame,

a carriage mounted in the frame and located between the rollers and having an"arm extending substantially radially across one end of theother roller and the axle for, said other roller b g p ed to sa r 0 pivot located at one end of said other roller and extending in a direction at,an angle to the planesof the runs of the belt between the rollers whereby the pivoted axle is shiftable on its pivot fore and aft relatively to the first roller, said pivoted axle having an arm extending along the carriage forming a bell crank lever with the axle and means for cooperating with said arm and the-carriage to adjust the angle of the. pivoted axle.

4. In a portable abrading machine, the combination of a frame, a pair of rollers, an abrading belt movable over the rollers, axles on which the rollers are mounted, the axle for .one roller being mounted in the frame, a carriage mounted in the frame and located between the rollers and having an arm extending substantially radially across one end of the otherroller. and the axle for the other" ill roller being pivoted-to said arm on a pivot 7 located at Lone end of said other rollerand extending in a direction at an angle to the;

planes, of thefrufis. of. the belt between the rollers whereby the pivoted axle is shiftable on its pivot foreand a ftrelatively to the first roller,"'said pivoted axle having an amn excranklever with the axle and means for cooperating with said arm and the carria e to adjust the angle of the pivoted axle, sai carriage being also adjustable forwardly and J fearwardly in the same direction as the pivotal movement of-the adjustable'axle. v

5. In a portable abrading machine, the v combination of a frame, a pair of rollers and 8 an abradin belt movable over the rollers,

the frame aving a portion extending between the rollers and formed with a trans-- verse slot. facing one of the rollers, axles for the rollers, one of the axles being a driving 10 axle, means carried by the body for actuatin the driving axle, a'carriage 1n the form 0 a slide, mounted in said slot and adjustable. forwardly and rearwardly therein, the other. axle bein carried by said slide, the last mentioned a e being pivoted to the slide at one end of its roller and adjustable fore and aft on its pivot.

6. In a portable abrading machine, the combination of a frame comprisin a portion aehaving means for supporting a es, rollers v mounted on the axles and an abradin belt movable over the rollers, the axles. ing supported entirely at like ends and free at theirother ends, the free ends of the axles 2e terminating short of the planes of the free ends of the rollers, the machine being supported entirely on the lower run of the belt. 7. In a portable abrading machine, the combination of a frame comprising a P01: :0 tion having means for supporting axles, roll- ,ers mounted on the axles and anabrading belt movable over the rollers, the axles being supported entirely at like ends and free at their other ends, the free ends of the axles 36 terminating short of the free ends of the rollers and the side of the frame toward the free ends of the rollers terminating near the free ends of the rollers whereby no part of the frame and associated parts pro ect be- 40 yond the free ends of the rollers.

,8. In a portable abrading machine, the combination of a framehaving means for supportin axles, a pair of rollers mounted I on the a es, an abrading belt movable over A! the rollersighe means for supporting one of the, axles ing an angular arm rigid with that axle and forming a bell crank lever therewith, said arm extending in a direction parallel to a plane containing theaxes of th rollers and means for adjusting the arm on its-pivot and thereby changing the angle of the axle which forms a be crank lever-with said arm;

In testimony whereof, I have hereunto llsi edm name atS useinthecoun of OnonJaga, anll in ti tatdof New YorFk eS i this 8th day of 'June, 1926 TH R N, muons. 

